Pin-tumbler lock



March 25 -1924. 1,487,9Q0

- E. L. TEICH P IN TUMBLER LOQK Filed May 5, 1922 Patented Mar. 25,1924.

l dtl tdii FA @FFEC ERITTEST L. FETCH, OF NEVT BRITAIN, CGNNECTICU'I,ASSIGN'OE-J TO THE AMERICAN HARDWARE COR-PULMK'LIOKL 0'11 NERVBRI'EEIN,CONNECTICUT, A CORPORATION OF CONNECTICUT.

BIN-TUMBLER LG CK.

Hpplication filed: May a type in which the key operated plug is adaptedto be turnedone complete revolution in either direction to a fixedangular posis tion; 7

An object of the invention: is to provide novel and improved means in alock of: this character for preventing thepliug from being tin-nod ineither direction beyond said fixed angular positionr Another object ofthe invention is to provide novel and improved means in a pin tumblerlock for holding the key operated plug from axial! movement.

The several: features ot the invention will be clearly understood fromthe following description and accompanying drawings, inv which Figures 1and 2 arerear end and side elevations of one form of my improved lock;

' Fig Sis-a sectional view taken on the line 33 of Fig2;

Fig. 4 is a rear end view of the lock. in its preferred form;

Fig. 5' is a sectional view takenon the line 5 5 of Fig. d; and V Fig. 6is a detail perspective view of a component part of the stopping devicesfor the key operated plug of the lock.-

Each of the locks illustrated in the. draw ings is provided with acylindrical lock case 2, and a key operated plug 4 which is capable ofbeing turned one complete revolution in either direction to a fixedangular position, in Which position the key may be inserted and removed.Each of the locks is also provided with stopping devices for positivelypreventing the key operated plug from being turned in either directionbeyond said fixed angular position. In the construction illustrated inFigs. 1, 2 and 3 the stopping devices comprise a radial slot in the rearend of the lock case forming opposed stop shoulders 6 and 8 that arespaced apart. A collar or washer 10 is loosely mounted on the keyoperated plug 4 and is held from axial movement thereon by beinginterposed between the rear end of the lock case and the flange 12 of acollar 14 secured by a pin it on the rear end of the plug which isreduced in diameter so as to form a: shoulder 18 against which thecollar is held. The rear end of the lock case is countersunk to receivethe washer 10 so that the rear face of the washer is substantially flushwith the rear end of the lock case. The washer 10 is provided with aradially ext-ending stop lug 20 that projects between the stop shoulders6 and 8, the stop shoulders cooperating with the stop lug 20 to definethe limits of movement of the washer 10. The end of the stop lug 20 isturned rcarwardly at right angles to form a stop 22 which is adapted tobe engaged by a stop lug 24;: projecting radially from the collar flange12. With this construction it will be apparent that the extent ofrotation of the key operated plug in a clockwise direction, viewing Fig;1, will be limited by the stop shoulder 6 through the stop lugs 20 and24:, and? that the extent of rotation of the key operated plug in acounter-clockwise direction will be limited by the stop shoulder 8through the stop lugs 20 and 24:. As shown the spacing of the stopshoulders 6 and 8 and:- the width of the stop lugs 20' and 24: are suchthat the plug is permitted to be turned one complete revolution ineither direction to a fixed angular position and is positively preventedfrom being turned in either direction beyond said position the key beingadapted to be in-- serted and removed when the plug is in this position.

In the construction. illustrated in Figs. 4, 5 and 6 of the drawings theprojecting rear end portion of the key operated plug is reduced indiameter to form a shoulder 26 and both a washer 10 and a flangelesscollar 14 are mounted on this reduced portion, the washer being looselymounted and the collar being fixed by a pin 16. The washer is providedwith a radially extending lug 20 that extends between the stop shoulders6 and 8 on the rear end of the casing. The Washer is also provided witha rearwardly projecting stop lug 22 that is struck up from the washer inradial alinement with the stop lug 20'. The stop lug 22' is arranged inthe path of movement of a stop lug 24- proin Figs. 4, 5 and 6 is foundpreferable in some cases.

It will be apparent that in both forms of locks that the collar and*asher on the rear end of the key operated plug cooperate with the usualhead 30 on the front end of the plug'to hold the plug from axialmovement. As will be evident to those skilled 1n the art my inventionpermits of various modifications without departing from the spiritthereofv or the scope of the appended claims.

lVhat I claim is:

l. A pin tumbler lock having, in combination, a pin tumbler lock case,means comprising a key operated plug adapted to be turned in oppositedirections to a fixed angular position and permitting the removal ofthe. key when the plug is in said position, 7

and stopping devices comprising fixed stops on said pin tumbler lockcase arranged exteriorly of and adjacent to the rear end of the lockcase for preventing the plug from being turned in either directionbeyond said position.

2. A pin tumbler lock having, in combination, a pin tumbler lock case,means comprising a key operated plug adapted to be turned in oppositedirections to a fixed angular position and permitting the removal of thekey when the plug is in said position, said lock case and plug havingco-operating stops for preventing the plug from being turned in eitherdirection beyond said fixed angular position, and said plug having itsinner end projecting beyond the inner end of the lock case. v

3. A pin tumbler lock having, in combina tion, a pin tumbler lock casehaving spaced stop members on its rear end, a key operated plug adaptedto be turned in opposite directions to a fixed angular position andpermitting the removal of the key when the plug is in said position, acollar carried by the rear end of the plug having a radially extendingstop member, and a washer loosely mounted on the plug between the collarand rear end of the casing and having a, stop member extending betweensaid stop members on the casing and having a stop member arranged to beengaged by the'stop men her on the collar when said plug is turned ineither direction to said fixed angular position, said stop members onthe casing, washer and collar constructed and arranged to cooperate toprevent the plug from being turned in either direction beyond said fixedangular position.

4. A pin tumbler lock having, in combination, a pin tumbler lock casehaving a radial slot in its rear end forming spaced stop shoulders, akey operated plug adapted to be turned in opposite directions to a fixedangular position and permitting the removal of the key when the plug isin said position, a collar carried by the rear end of the plug having aradially extending stop member, and a washer loosely mounted on the plugbetween the collar and the rear end of the casing having a radiallyextending stop member extending between said stop shoulders and a stopmember struck up therefrom and arranged to be engaged by said stopmember on the collar when said plug is turned in either direction tosaid fixed angular osition said sto shoulders on the cas-.

spaced stop members thereon, a stop member movable in oppositedirections havin'gcthe limits of its movements defined by the stop theplug from being turned in eitherdirec- 7 tion beyond said fixed angularposition.

ERNEST L. anion.

members on the casing, respectively, a key operated plug adapted to beturned in oppo-

